What is an antonym for style?

There isn't one perfect antonym for "style" as it can have multiple meanings. It depends on the context. Here are some possibilities:

If "style" refers to a distinctive appearance or manner:

* Plainness

* Simplicity

* Lack of flair

* Blandness

* Commonplace

If "style" refers to a particular way of doing something:

* Inefficiency

* Clumsiness

* Inelegance

* Rudeness (if "style" refers to manners)

* Incompetence (if "style" refers to skill)

If "style" refers to a literary or artistic genre:

* Formlessness

* Unstructured

To get a more accurate antonym, consider the specific context in which you are using the word "style."